Problem with Novatouch Coolermaster (arrow key don't work)

[Beupha]

Hello,

For a few days now, I've been having a problem with my Coolermaster Novatouch keyboard.
The right and left arrow keys no longer work.
I've already tried another keyboard, and it works fine: this confirms a hardware problem.
I'm not really sure what to do to fix this.
If anyone has any ideas to help me, I'd love to hear them!

Thank you.